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Zoom lens and image pickup apparatus using the same

A zoom lens and focal length technology, applied in the field of zoom lenses, can solve problems such as insufficient correction of aberrations, astigmatism, large prisms, and long lens systems

Inactive Publication Date: 2013-01-23
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the prisms of the optical system described in Japanese Patent No. 4496460 are large, so the first lens group including the prisms is enlarged.
In addition, the overall length of the lens system is long, and the correction of peripheral aberrations, especially astigmatism, is insufficient.

Method used

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  • Zoom lens and image pickup apparatus using the same
  • Zoom lens and image pickup apparatus using the same
  • Zoom lens and image pickup apparatus using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0208] unit mm

[0209] surface data

[0210]

[0211] Aspheric Data

[0212] side 6

[0213] K=-0.774

[0214] A4=-6.99084e-05, A6=-1.63964e-06

[0215] side 7

[0216] K=-0.604

[0217] A4=1.85716e-05, A6=-1.06515e-06

[0218] side 13

[0219] K=-1.175

[0220] A4=3.45070e-05, A6=-1.39300e-05

[0221] side 16

[0222] K=-2.714

[0223] A4=1.15704e-03, A6=-2.57943e-06

[0224] side 17

[0225] K=0.000

[0226] A4=1.77061e-03, A6=-1.33371e-05

[0227] side 22

[0228] K=-5.000

[0229] A4=-1.33394e-04, A6=1.40162e-05

[0230] side 23

[0231] K=0.000

[0232] A4=-1.06788e-03, A6=2.28369e-05

[0233] zoom data

[0234]

[0235] Group focal length

[0236] f1=12.12 f2=-6.19 f3=15.69 f4=10.16 f5=-8.00 f6=16.56

Embodiment 2

[0238] unit mm

[0239] surface data

[0240]

[0241] Aspheric Data

[0242] side 6

[0243] K=-2.954

[0244] A4=5.02895e-05, A6=-1.18713e-06

[0245] side 13

[0246] K=-1.969

[0247] A4=1.04106e-04, A6=-1.38113e-05

[0248] side 16

[0249] K=-2.313

[0250] A4=1.74342e-03, A6=-4.00607e-05

[0251] side 17

[0252] K=0.413

[0253] A4=1.62982e-03, A6=-3.16420e-05

[0254] side 20

[0255] K=5.000

[0256] A4=-8.14081e-05, A6=-1.27850e-04

[0257] side 23

[0258] K=4.067

[0259] A4=2.12756e-03, A6=-1.34525e-04, A8=3.63385e-06

[0260] zoom data

[0261]

[0262] Group focal length

[0263] f1=13.64 f2=-6.91 f3=28.00 f4=9.74 f5=-12.94 f6=17.08

Embodiment 3

[0265] unit mm

[0266] surface data

[0267]

[0268]

[0269] Aspheric Data

[0270] side 6

[0271] K=-1.750

[0272] A4=-9.00224e-06, A6=-7.85006e-07, A8=-2.35555e-09

[0273] side 13

[0274] K=-3.586

[0275] A4=2.10649e-04, A6=-3.26039e-05, A8=2.19504e-06

[0276] side 16

[0277] K=-2.046

[0278] A4=9.94381e-04, A6=-5.98107e-06, A8=-1.31721e-06

[0279] side 17

[0280] K=0.334

[0281] A4=1.56279e-03, A6=-1.78961e-05, A8=-8.58221e-07

[0282] side 20

[0283] K=-5.000

[0284] A4=5.13699e-04, A6=-1.42025e-04, A8=1.14173e-05

[0285] side 21

[0286] K=5.000

[0287] A4=4.00731e-04, A6=-8.42378e-05, A8=1.07902e-05

[0288] side 22

[0289] K=4.901

[0290] A4=-7.22257e-04, A6=-2.68119e-07

[0291] zoom data

[0292]

[0293] Group focal length

[0294] f1=13.30 f2=-6.68 f3=26.00 f4=9.94 f5=-15.34 f6=22.79

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PUM

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Abstract

The invention provides a zoom lens and an image pickup apparatus using the same. A zoom lens includes, in order from the object side, a positive first lens group, a negative second lens group, a positive third lens group, a positive fourth lens group, a negative fifth lens group, and a positive sixth lens group. The first lens group, the third lens group, and the sixth lens group are fixed. The second lens group, fourth lens group, and the fifth lens group are movable. The first lens group includes a reflecting optical element that bends the optical path. The second lens group includes a negative lens and a cemented lens made up of a negative lens and a positive lens. The third lens group includes an aperture stop. The fourth lens group includes a positive lens and a negative lens. The fifth lens group includes a negative lens.

Description

technical field [0001] The present invention relates to a zoom lens, in particular to an optical path bending type zoom lens and an imaging device using the zoom lens. Background technique [0002] In recent years, in compact cameras, the number of pixels and the sensitivity of imaging elements have been increased. As a result, the size of the imaging element used becomes large. In response to the increase in the size of the imaging element (higher pixel count), the optical system of the compact camera is also required to be smaller and thinner. As such a small and thin optical system, there is an optical system in which a prism is arranged in the optical path of the optical system, and the optical path is bent by the prism to achieve thinning (Japanese Patent No. 4496460 specification). [0003] Japanese Patent No. 4496460 discloses a zoom lens as follows: the zoom lens consists of a first lens group with positive refractive power and fixed during zooming, a second lens g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/173H04N5/225
CPCH04N5/225G02B15/173G02B15/1461
Inventor 藤仓崇
Owner OLYMPUS CORP